Container for powder, a method for marking/identification of a powder container and an apparatus for use of powder from the container

ABSTRACT

A container for powder, a method for marking of the containers for the powder and an apparatus for use of a powder. At least one radio-frequency identification chip provided in the container, wherein the radio-frequency identification chip stores at least one set of parameters for material characterization of the powder in the container. A unique key is assigned to every type of powder by means of which the data in the radio-frequency identification chip located in the container are readable, writeable and updateable via an antenna arranged outside the container.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority from German Patent Application No. 102012 102 885.0, filed Apr. 3, 2012, which application is incorporatedherein by reference to its entirety.

FIELD OF THE INVENTION

The invention relates to a powder container.

The invention also relates to a method for marking a powder container.According to one possible embodiment, the powder serves to coat asubstrate in an apparatus for coating.

Furthermore, the invention relates to an apparatus for use of powder. Inthe embodiment shown, an apparatus is described for coating a substrate.There is a container provided for an apparatus, which container containsthe powder used for coating. Furthermore, there is a suction meansarranged in the container which serves to suck up the powder from asurface of the powder out of the container. Likewise, the suction meansis responsible for transport of the powder from the container to thesubstrate. The container is standing on a pair of scales during removalof the powder from the container.

BACKGROUND OF THE INVENTION

The containers for the powder are used, for example, to feed meteredquantities of fine-grained powder for plasma coating processes, or aplasma coating installation. It is important in this process to avoidpowder agglomerations and deposits since, otherwise, transport of thepowder can come to a standstill.

International patent application WO 2012/139840 A1 discloses anapparatus and a method for conveying powder. A container is provided forthe powder, wherein the powder defines a surface in the container. Asuction means has formed a suction opening for sucking up the powderfrom the surface. A motion means serves to generate a relative movementbetween the suction opening and the surface of the powder. Sucking upthe powder takes place during the relative movement, wherein a speed ofthe relative movement can be altered in such a way that a constant massflow of the powder occurs from the container to the substrate.

German disclosure document DE 10 2010 014 552 A1 discloses a method forplasma coating of a substrate surface with a coating fluid. A plasmabeam of a low temperature plasma is directed at a substrate surface. Thecoating fluid consists of a carrier fluid and a fine-grained powder. Thecoating fluid is homogenized in an homogenization container and passedon to the plasma by means of a pump and metering system.

European patent application EP 2 282 184 A1 discloses a container formonitoring a fill level of the goods to be removed from the container.The container is suitable for storing powder. There is at least oneradio-frequency identification (RFID) chip attached in the container,for example to the bottom of the container. An optical sensor is used inconnection with the RFID chip to determine the fill level. The optionfor material characterization using the RFID chip is not disclosed.

U.S. patent application no. 2006/0132351 A1 discloses a container formonitoring a fill level of a powdered material in which at least oneRFID chip is attached. Different containers can be differentiatedbetween on the basis of a set of parameters with identification numberswhich the RFID chip carries. Sets of parameters for materialcharacterization, at least those concerning the material identificationand quality, are described but these are not put on the REID chip butare determined instead through measurement together with the REID chip.A key which allows activation for use of the container is not disclosed.

International patent application WO 2005/002992 A1 discloses a containerwhich is suitable for storing powder and which is provided with at leastone RFID chip. The RFID chip is already provided by the manufacturer ofa set of parameters for identification of the container and/or itscontents. Furthermore, the RFID chip is attached in a separate pocketoutside on the container. A key which allows activation for use of thecontainer is not disclosed.

There is an apparatus disclosed in the German patent application DE 102007 013 093 A1 for use of powder with a container for storing powder.An arrangement of an RFID chip which carries a parameter set formaterial characterization is not mentioned. Also the Japanese patentapplication JP 2001 130 743 does not disclose arrangement of a RFID chipin the container. It simply discloses sucking up of the powder out ofthe container.

Sucking up of the powder takes place exclusively from the surface of thepowder contained in the container. In order to achieve a constant massflow of powder from the container to the surface of a substrate it isabsolutely essential that certain quality criteria of the powder aremet. The quality criteria of the powder are not only responsible fortransport of the powder from the container to the substrate but alsoinfluence the quality of the coating applied to a surface of thesubstrate. Transport of the powder and the quality of the coating dependon the mass, the size of the powder particles and possibly contaminationof the container.

BRIEF SUMMARY OF THE INVENTION

It is an object of the invention to provide a powder container, whereinthe option is created by means of the container to check and monitor thecharacteristic parameters of the powder and wherein these parametersremain permanently assigned to the powder present in the container.

This object is solved by a container for powder which comprises: atleast one radio-frequency identification (REID) chip provided in thecontainer, wherein the RFID chip stores at least one set of parametersfor material characterization of the powder in the container; and aunique key is assigned to every type of powder by means of which thedata in the RFID chip located in the container are readable, writeableand updateable via an antenna arranged outside the container.

A further object of the invention is to create a method for marking apowder container so that it is secure for the company operating anapparatus to use this powder, that the powder used meets certain qualitycriteria or the parameters are fulfilled which are necessary for aqualitatively adequately good processing of the powder with theapparatus for use of the powder.

The task described above is solved by a method, which comprises thefollowing steps:

-   -   assigning at least one RFID chip to each container for the        powder;    -   filling the powder into the container;    -   calling up a key for the at least one REID chip by a        manufacturer for an apparatus for use of the powder; and,    -   reading, writing and updating data of the at least one RFID chip        contained in the container by means of the key with an        individual set of parameters via an antenna located outside the        container.

An additional object of the invention is to create an apparatus for useof the powder wherein it is secure that certain quality criteria or theparameters for the powder used for the apparatus are fulfilled.Furthermore, the apparatus allows easier and simpler setting up of theapparatus for use of the powder.

The above object is solved by an apparatus for use of powder, Whichcomprises:

-   -   a container for the powder;

a suction means for sucking up the powder from a surface of the powderout of the container and to transport the powder;

-   -   at least one RFID chip is provided with the container; and,    -   at least one antenna provided for outside the container, for        reading and/or writing from or onto the at least one RFID chip,        wherein only powder can be used in the apparatus which is        released by means of the key.

A powder container is disclosed according to the invention. Although thefollowing description refers to a powder container for coating of asubstrate, this should not be seen as a limitation of the invention. Thecontainer can be used for general metering installations, weighingequipment, filling installations, mixing installations, etc. There is atleast one RFID chip provided in the container, which has at least oneset of parameters for material characterization of the powder containedin the container. Each type of powder is assigned an extra key withwhich the data contained in the RFID chips in the container can be read,written and updated via an antenna arranged outside the container. Usingthe parameters activated by an authorized key for the powder containedin the container, an option is created for additional quality assurance.Thus, a user of powder can be quite sure that he is using qualitativelycertified powder. Furthermore, it is ensured for the manufacturer of theinstallation for using the powder that only certified powder can be usedon the installations. If a malfunction occurs, the manufacturer of theinstallation can, in a very simple way, check whether non-authorizedpowder was used on the installation. The powder data resp. parametersare, for example, stored in a memory unit in the installation.

The RFID chip also functions when it is covered on the bottom of thecontainer by a metallic or electrically conductive powder or is embeddedin a metallic or electrically conductive powder.

As already mentioned there is the possibility of use of an appropriatelyfitted out container in the coating area. For a coating installation itcan, for example, be an installation for coating using a plasma. Thisshould not be considered as a limitation of the invention.

The RFID chip can be attached to the bottom of the container.Furthermore, the RFID chip can be attached to a wall of the container.It is also conceivable that a number of RFID chips are arranged evenlydistributed in the powder within the container. This means that the RFIDchips swim freely in the powder. The powder can be an electricallyconductive powder.

The method according to the invention serves to mark a powder container.The powder can be used in an apparatus for using the powder. One optionfor use is coating of a substrate in an apparatus for coating. Althoughthe following description is limited to a method for coating asubstrate, this should not be considered as a limitation of the methodaccording to the invention. At least one RFID chip is assigned for eachcontainer for the method for marking/identifying a container. The powdercan be filled into the container once this has been completed. For acase where a plurality of RFID chips are arranged evenly distributed inthe powder, the RFID chips are mixed together with the powder and filledinto the container. Once the powder and the RFID chip are located in thecontainer, a key is called up or requested by a manufacturer of theapparatus for use or for coating a substrate. The keys can, for example,be managed in a central database. The data of the at least one RFID chipcontained in the container are read, written and called up by means ofthe key with an individual set of parameters via an antenna arrangedoutside the container. The antenna can, for example, surround thecontainer. Here, the antenna can be designed as both a transmitter and areceiver.

It is also possible that the individual set of parameters is read,written and updated during the process of coating of a substrate withpowder during emptying of the powder out of the container. The set ofparameters can include the setting values of the apparatus for coatingwhich is stored on the RFID chip. These setting values of the apparatusfor coating can be used for further subsequent work steps of theapparatus. The set of parameters also comprises hatch and manufacturerverifications for the powder. The set of parameters furthermorecomprises the filling quantity of the powder contained in the container,which significantly simplifies setting up of the apparatus for reneweduse of the container in a later work step. One further option for a setof parameters is the material characterization of the powder containedin the container. Here, the material characterization comprises, forexample, the distribution of particle size of the powder, its electricalproperties, the date of manufacture, etc. The set of parameters can alsorepresent a residual quantity of the powder contained in the container.The residual quantity of the powder contained in the container formsduring the emptying process in the apparatus for coating and is writtenfor further processing steps on the RFID chip.

The set of parameters can also comprise a position or location of asuction means with reference to a surface of the powder contained in thecontainer so that it is possible for a renewed start-up of the apparatusfor coating in a partially emptied container that the suction means canbe moved by means of an adjustment device at a defined distance to thesurface or at a defined immersion depth in the surface of the powder.

The description of the apparatus also refers to an apparatus for coatinga substrate. It is self evident for a person skilled in the art that theapparatus can above all be used for all powder containers for whichpowder from a container for arbitrary applications is used. Thefollowing description should not represent a limitation of theinvention. The apparatus for coating a substrate is assigned to a powdercontainer used for the coating. Furthermore, the apparatus possesses asuction means, which serves to suck up the powder from the surface ofthe powder out of the container. The suction means also serves totransport the powder from the container to a substrate. The containerstands on a pair of scales during removal of the powder from thecontainer by using the suction means. The container itself is equippedwith an MID chip and is provided with at least one antenna outside thecontainer for reading data from at least one RFID chip and/or writing ofdata onto at least one RFID chip. It is also possible to lock down theapparatus using the data on the RFID chip authorized by the key if thereis powder in the apparatus which is not released by a key or there is noRFID chip assigned to the powder container.

The antenna itself can be integrated into the pair of scales. Theantenna can also just be assigned to the pair of scales so that the RFIDchip can be detected by the antenna.

The apparatus comprises an adjusting element so that the suction meanscan be positioned on the basis of the data present on the REID chiprelative to the surface of the powder present in the container in such away that a required quantity of powder per unit of time for coating thesubstrate can be set automatically.

The sucking up of the powder using the suction means in the cover layerpreferably takes place near to the surface of the powder. This suckingup near to the surface of the powder also always ensures, forfine-grained powders with particle sizes of 0.01 to 100 μm, thatadequate transport of the powder from the container to the substrate isachieved. As already mentioned, three-axis systems can be used as motionmeans for generation of the relative movement. Using this motion means,it is possible to generate a movement of the suction means in the X, Yand Z direction. Thus, through use of the three-axis system, it ispossible to effect distribution of the suction means in the Z directionwhich is defined on the basis of the data on the REID chip. It istherefore possible, by means of the data present on the RFID chip, toachieve exact setting up of the suction means in relation to the powderpresent in the container.

Using this setting in the Z direction, it is therefore possible toachieve a constant immersion depth of the suction means in the surfaceof the powder. It is also possible to achieve a corresponding trackingor positioning of the suction opening of the suction means if an alreadyused container is again used in the apparatus for coating in order tocoat a further substrate with the same material or powder.

BRIEF DESCRIPTION OF THE DRAWINGS

The nature and mode of operation of the present invention will now bemore fully described in the following detailed description of theinvention taken with the accompanying drawing figures, in which:

FIG. 1 is an apparatus for forwarding powder, wherein the apparatusshown here is used to coat a substrate with powder and the fine-grainedpowder is conveyed by the container to the substrate;

FIG. 2 is an embodiment of the container according to the inventionwherein the RFID chip is attached to the bottom of the container;

FIG. 3 is a further embodiment of the container according to theinvention wherein the RFID chip is attached to a wall of the container;

FIG. 4 is a further embodiment of the container according to theinvention wherein a plurality of RFID chips is evenly distributed in thepowder;

FIG. 5 is a schematic representation of a portion of the apparatus forusing powder, wherein here the apparatus is an apparatus for coating andthe container stands on a pair of scales, which has an antenna assignedto it or in which an antenna is integrated; and,

FIG. 6 is a schematic representation of a block diagram of the methodaccording to the invention for which the respective data is assigned toan RFID chip in order to characterize the powder which is in thecontainer.

DETAILED DESCRIPTION OF THE INVENTION

At the outset, it should be appreciated that like drawing numbers ondifferent drawing views identify identical, or functionally similar,structural elements of the invention. While the present invention isdescribed with respect to what is presently considered to be thepreferred aspects, it is to be understood that the invention as claimedis not limited to the disclosed aspects.

Furthermore, it is understood that this invention is not limited to theparticular methodology, materials and modifications described and, assuch, may, of course, vary. It is also understood that the terminologyused herein is for the purpose of describing particular aspects only,and is not intended to limit the scope of the present invention, whichis limited only by the appended claims.

Unless defined otherwise, all technical and scientific terms used hereinhave the same meaning as commonly understood to one of ordinary skill inthe art to which this invention belongs. Although any methods, devicesor materials similar or equivalent to those described herein can be usedin the practice or testing of the invention, the preferred methods,devices, and materials are now described.

FIG. 1 shows apparatus 200 for coating using fine-grained, non-flowablepowder 1 with particle sizes of 0.01 μm to 100 μm. Powder 1 is stored incontainer 2. Powder 1 in container 2 forms surface 3 from which powder 1can be removed from container 2 using suction means 6. Suction means 6can be moved using multi-axis system 41 in X direction X, Y direction Yand Z direction Z in order to suck up the powder from whole surface 3.Pressure difference Δp is formed between first working space 51 andsecond working space 52. Based on pressure difference Δp it is possiblethat powder 1 is transported out of container 2 to surface 35 ofsubstrate 36 which is located on second working space 52.

One option for adjusting pressure difference Δp between surface 3 ofpowder 1 and surface 3 of substrate 35 or between first working space 51and second working space 52 is offered by membrane pump 12. In thiscase, membrane pump 12 is connected to suction side 13 with suctionmeans 6. Pressure line 16 is attached to pressure side 15 of membranepump 12, which pressure line is connected with beam generator 31 forgenerating a focused plasma beam 32 through arc discharge. Plasma beam32 from beam generator 31 is used to transport powder 1 by means ofnozzle 33 in the area of its outlet 34 into the feed area. The finelydistributed powder 1 is separated out by plasma beam 32 onto surface 35of substrate 36 as coating 37. Beam generator 31 has inner rod-shapedelectrode 38 to generate plasma beam 32 and sheathed electrode 39surrounding this, insulated from inner rod-shaped electrode 38, whichhas working gas 40 flowing through it from the opening opposite nozzle33.

FIG. 2 shows a schematic embodiment of container 2 for powder 1, whichis used with the current invention. RFID chip 20 is provided for in oron floor 4 inside container 2. Powder 1 is filled into container 2 andthus covers REID chip 20 attached to floor 4 of container 2. Here, RFIDchip 20 can be directly glued to or laid directly on floor 4. It is alsopossible for RFID chip 20 to be fitted with a cover (protective cover;not shown) before the powder 1 is filled in.

FIG. 3 shows another embodiment of container 2. In this case, RFID chip20 is mounted on wall 5 of container 2. It is also possible, in thiscase, as already mentioned in the description to FIG. 2, that RFID chip20 is additionally fitted with a protective cover.

FIG. 4 shows a further embodiment of container 2. Here, powder 1 isalready mixed with a plurality of REID chips 20 before it is filled intocontainer 2. Plurality of RFID chips 20 is here essentially arrangedevenly distributed within powder 1. Therefore, RFID chips 20 swim freelyin powder 1 present in container 2.

FIG. 5 shows a schematic arrangement of container 2 with powder 1 withinapparatus 200 for coating substrate 36. Apparatus 200 for coatingsubstrate 36 has pair of scales 42 on which container 2 stands. Asalready mentioned in the description to FIGS. 2 to 4, there is at leastone RFID chip 20 provided in container 2. Antenna 10 is assigned tocontainer 2, which is standing on pair of scales 42. Here, antenna 10can be integrated into pair of scales 42. One further option is thatantenna 10 surrounds container 2 while the latter sits on the pair ofscales 42. Both possible embodiments are represented in FIG. 5. Throughcontinuous weighing of mass M of powder 1 in container 2 during suckingup of powder 1, the current mass M of powder 1 in container 2 can thusbe determined. The data so obtained are passed on to electronic unit 43.Operational amplifier 26 is provided between pair of scales 42 andelectronic unit 43 in order to obtain the most accurate measurement datawith the pair of scales 42 with respect to mass M of powder 1 incontainer 2. For the case where the coating process with powder 1 of aparticular type is ended, setting up of apparatus 200 can therefore beundertaken for renewed use of this opened packing unit of powder 1 usingthe data which is stored in electronic unit 43 and written on RFID chip20 for renewed use of powder 1 of said certain type for coatingpurposes. It is therefore, for example, possible that the suction meansis moved in Z direction Z in such a way that the suction means reachesan appropriate distance for an appropriate immersion depth to beachieved in surface 3 of powder 1. It is therefore possible to approachapparatus 200 automatically so that all parameters required for thecoating are set up. Furthermore, the data stored on RFID chip can beused to again to set up the conveying rate of powder 1 out of container2. The setting-up of apparatus 200 can be simplified considerably fordifferent types of powder 1. By means of antenna 10, the data are readout from RFID chip 20 and passed on to electronic unit 43, whichsubsequently undertakes the respective settings of apparatus 200 forcoating substrate 36.

FIG. 6 shows a schematic representation of the method for marking ofcontainer 2 for powder 1. There is initially at least one RFID chip 20assigned to each container 2, which is suitable for receiving powder 1.Powder 1 is made available by various manufacturers in the widestpossible range of powder types. Powder 1 is passed on to distributors 30who subsequently fill powder 1 into different containers 2. Here, oneshould note that container 2 is possibly already fitted with RFID chip20, wherein RFID chip 20 is always provided inside container 2. It isalso possible to mix a plurality of RFID chips 20 with powder 1 and topour the mixture of powder 1 and RFID chip 20 into container 2.Distributors 30 call up key 21 from manufacturer 100 for apparatus 200for use of powder 1 or apparatus 200 for coating substrate 36.

The limitation in the following description of apparatus 200 for coatingsubstrate 36 is not to be considered as a limitation of the invention.Apparatus 200 for use of powder 1 can be a general meteringinstallation, a weighing system, a filling installation, a mixinginstallation etc. There is therefore an extra key 21 assigned for everytype of powder 1. Using key 21, data available on REID chip 20 incontainer 2 are read, written and updated with an individual set ofparameters via antenna 10 arranged outside container 2. RFID chip 20activated by distributor 30 by means of key 21 gets in container 2 toapparatus 200 for coating substrate 36. Apparatuses 200 for coating asubstrate are usually installed at the premises of an appropriateinstallation operator who applies a coating to the broadest range ofsubstrates 36. The pair of scales 42 of apparatus 200 for coating isalso a quality assurance system so that, for coating, only powder 1which was released by the prescribed key 21 can be used with apparatus200. To this effect, as mentioned above, pair of scales 42 is fittedwith antenna 10. Antenna 10 can be designed as a transmitter and/or areceiver.

It is also possible, using antenna 10 during emptying of powder 1 fromcontainer 2, to read, to write and to update an individual set ofparameters on REID chip 20. The set of parameters which are stored onREID chip 20 can, for example, be setting values of apparatus 200 forcoating. The setting values can also be used for the subsequent worksteps for apparatus 200 for coating. The set of parameters alsocomprises batch and manufacturer verifications for powder 1. It isnecessary, in case there are any problems arising during the coatingprocess, that proof is furnished in a simple way that only powder 1specified by manufacturer 100 was used for apparatus 200 for the coatingoperation. If this is not the case, then the company operating anapparatus for coating used a non-specified powder 1 or a distributor 30filled in a non-specified powder 1. One further option for a set ofparameters is the material characterization of powder 1. Materialcharacterization includes, for example, the distribution of theindividual particle sizes in powder 1, the density, the flowingcharacteristics, the electrical conductivity and the chemicalcomposition of powder 1, etc.

It is also possible, as already mentioned in the description to FIG. 5,to detect a residual quantity of powder 1 in container 2. The residualquantity of powder 1 accrues from the emptying process in apparatus 200for coating. The residual quantity present in the container cantherefore be written onto RFID chip 20. The residual quantity istherefore an indicator of the location of surface 3 of powder 1 incontainer 2. To reuse container 2 with apparatus 200 for coating,apparatus 200 for coating can be set up in a simple manner by using thedata available on REID chip 20. Setting up of apparatus 200 can heretake place completely automatically, wherein the suction means is movedin Z direction Z in such a way that it is located at a defined distancefrom, or at a defined immersion depth in, surface 3 of powder L it istherefore possible that, without any influence from a user of apparatus200 for coating, change between the different, and to some extentapplied quantities of powder, is possible in the individual containers.

Thus, it is seen that the objects of the present invention areefficiently obtained, although modifications and changes to theinvention should be readily apparent to those having ordinary skill inthe art, which modifications are intended to be within the spirit andscope of the invention as claimed. It also is understood that theforegoing description is illustrative of the present invention andshould not be considered as limiting. Therefore, other embodiments ofthe present invention are possible without departing from the spirit andscope of the present invention.

REFERENCE NUMERALS

-   1 Powder-   2 Container-   3 Surface of the powder-   4 Bottom-   5 Wall-   6 Suction means-   10 Antenna-   12 Membrane pump-   13 Suction side-   15 Pressure side-   16 Pressure line-   17 Plasma coating apparatus-   20 RFID chip-   21 Key-   23 Arrangement-   26 Operational amplifier-   27 Segment-   28 Cable-   30 Distributor-   31 Beam generator-   32 Plasma beam-   33 Nozzle-   34 Outlet-   35 Surface-   36 Substrate-   37 Coating-   38 Rod-shaped electrode-   40 Working gas-   41 Multi-axis system-   42 Balance-   43 Electronics-   51 first working space-   52 second working space-   100 Manufacturer-   200 Apparatus for use-   M4 Mass of the powder-   Δp Pressure difference-   X x direction-   Y y direction-   Z z direction

What is claimed is:
 1. A method for marking containers for powder,comprising the following steps: assigning at least one radio-frequencyidentification chip to a container for a powder; filling said powderinto said container; calling up a key for said at least oneradio-frequency identification chip by a manufacturer for an apparatusfor use of said powder; and, reading, writing and updating data of saidat least one radio-frequency identification chip contained in saidcontainer by means of said key with an individual set of parameters viaan antenna located outside said container.
 2. The method recited inclaim 1, wherein said individual set of parameters are read, written andupdated during emptying of said powder from said container.
 3. Themethod recited in claim 1, wherein said individual set of parameterscomprises setting values for an apparatus for use of said powder andsetting values for at least one subsequent work step of said apparatusfor use of said powder.
 4. The method recited in claim 1, wherein saidindividual set of parameters are batch and manufacturer verificationsfor said powder and include a filling amount of said powder in saidcontainer.
 5. The method recited in claim 1, wherein said individual setof parameters includes material characterization of said powder in saidcontainer.
 6. The method recited in claim 1, wherein said individual setof parameters includes a residual quantity of said powder in saidcontainer, wherein said residual quantity is detected during an emptyingprocess in said apparatus for use of said powder and written onto saidat least one radio-frequency identification cam.
 7. The method recitedin claim 1, wherein said individual set of parameters comprises aposition of a suction means with reference to a surface of said powderin said container so that, for renewed starting-up of said apparatus foruse of said powder with a partially emptied container, said suctionmeans can be moved by means of an adjusting element in a defineddistance from said surface of said powder.
 8. The method recited inclaim 1, wherein said individual set of parameters comprises a positionof a suction means with reference to a surface of said powder in saidcontainer so that, for renewed starting-up of said apparatus for use ofsaid powder with a partially emptied container, said suction means canbe moved by means of an adjusting element in a defined immersion depthin said surface of said powder.